Sat, 19 Jul 2008 03:07:24 BST CiteULike: dcastro's Vian http://www.citeulike.org/user/dcastro/author/Vian CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2774523 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 12. (2000), pp. 2686-2691.</i><br /><br />This paper presents an optically switched X-band active antenna element for half-duplex transmit/receive (T/R) applications. The antenna element is designed to be a unit cell of a quasioptical array with fast switching between T and R and with built-in phase-shifterless beamforming. The measured performance of the active element is 14 dB gain contributed by the power amplifier (PA) in transmission and 16 dB gain contributed by the low-noise amplifier in reception, with 30 dB isolation between T and R. The switching is accomplished with only 1 μW of optical power for 1.7 μs switching time (1.7 pJ of optical energy) and a rise time of 2 ns at 10 GHz with 7 mW of optical power (14 pJ of optical energy). The design, implementation, and measured performance of the optically controlled transmit/receive circuit are presented A transmit/receive active antenna with fast low-power optical switching J Vian Z Popovic doi:10.1109/22.899031 Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 12. (2000), pp. 2686-2691. 2008-05-09T06:44:38-00:00 2000 Microwave Theory and Techniques, IEEE Transactions on 48 12 2686 2691 active antenna fast low power receiver transceiver transmiter